Columns are declared, giving the column header expected from the spreadsheet
file, the field to which the column corresponds. An optional block of code or
lambda expression can be provided to process the value from the spreadsheet
before assigning it to the corresponding field.

Multiple importers

Multiple importers can be declared for each data model class, by assigning them names:

Custom code during import

For cases when importing is not limited to merely assigning cell values to
fields, the user can provide a custom block of code where it can work directly
with the spreadsheet row and the model object being generated.